/**

 * jCarouselLite - jQuery plugin to navigate images/any content in a carousel style widget.

 * @requires jQuery v1.2 or above

 *

 * http://gmarwaha.com/jquery/jcarousellite/

 *

 * Copyright (c) 2007 Ganeshji Marwaha (gmarwaha.com)

 * Dual licensed under the MIT and GPL licenses:

 * http://www.opensource.org/licenses/mit-license.php

 * http://www.gnu.org/licenses/gpl.html

 *

 * Version: 1.0.1

 * Note: Requires jquery 1.2 or above from version 1.0.1

 */



/**

 * Creates a carousel-style navigation widget for images/any-content from a simple HTML markup.

 *

 * The HTML markup that is used to build the carousel can be as simple as...

 *

 *  <div class="carousel">

 *      <ul>

 *          <li><img src="image/1.jpg" alt="1"></li>

 *          <li><img src="image/2.jpg" alt="2"></li>

 *          <li><img src="image/3.jpg" alt="3"></li>

 *      </ul>

 *  </div>

 *

 * As you can see, this snippet is nothing but a simple div containing an unordered list of images.

 * You don't need any special "class" attribute, or a special "css" file for this plugin.

 * I am using a class attribute just for the sake of explanation here.

 *

 * To navigate the elements of the carousel, you need some kind of navigation buttons.

 * For example, you will need a "previous" button to go backward, and a "next" button to go forward.

 * This need not be part of the carousel "div" itself. It can be any element in your page.

 * Lets assume that the following elements in your document can be used as next, and prev buttons...

 *

 * <button class="prev">&lt;&lt;</button>

 * <button class="next">&gt;&gt;</button>

 *

 * Now, all you need to do is call the carousel component on the div element that represents it, and pass in the

 * navigation buttons as options.

 *

 * $(".carousel").jCarouselLite({

 *      btnNext: ".next",

 *      btnPrev: ".prev"

 * });

 *

 * That's it, you would have now converted your raw div, into a magnificient carousel.

 *

 * There are quite a few other options that you can use to customize it though.

 * Each will be explained with an example below.

 *

 * @param an options object - You can specify all the options shown below as an options object param.

 *

 * @option btnPrev, btnNext : string - no defaults

 * @example

 * $(".carousel").jCarouselLite({

 *      btnNext: ".next",

 *      btnPrev: ".prev"

 * });

 * @desc Creates a basic carousel. Clicking "btnPrev" navigates backwards and "btnNext" navigates forward.

 *

 * @option btnGo - array - no defaults

 * @example

 * $(".carousel").jCarouselLite({

 *      btnNext: ".next",

 *      btnPrev: ".prev",

 *      btnGo: [".0", ".1", ".2"]

 * });

 * @desc If you don't want next and previous buttons for navigation, instead you prefer custom navigation based on

 * the item number within the carousel, you can use this option. Just supply an array of selectors for each element

 * in the carousel. The index of the array represents the index of the element. What i mean is, if the

 * first element in the array is ".0", it means that when the element represented by ".0" is clicked, the carousel

 * will slide to the first element and so on and so forth. This feature is very powerful. For example, i made a tabbed

 * interface out of it by making my navigation elements styled like tabs in css. As the carousel is capable of holding

 * any content, not just images, you can have a very simple tabbed navigation in minutes without using any other plugin.

 * The best part is that, the tab will "slide" based on the provided effect. :-)

 *

 * @option mouseWheel : boolean - default is false

 * @example

 * $(".carousel").jCarouselLite({

 *      mouseWheel: true

 * });

 * @desc The carousel can also be navigated using the mouse wheel interface of a scroll mouse instead of using buttons.

 * To get this feature working, you have to do 2 things. First, you have to include the mouse-wheel plugin from brandon.

 * Second, you will have to set the option "mouseWheel" to true. That's it, now you will be able to navigate your carousel

 * using the mouse wheel. Using buttons and mouseWheel or not mutually exclusive. You can still have buttons for navigation

 * as well. They complement each other. To use both together, just supply the options required for both as shown below.

 * @example

 * $(".carousel").jCarouselLite({

 *      btnNext: ".next",

 *      btnPrev: ".prev",

 *      mouseWheel: true

 * });

 *

 * @option auto : number - default is null, meaning autoscroll is disabled by default

 * @example

 * $(".carousel").jCarouselLite({

 *      auto: 800,

 *      speed: 500

 * });

 * @desc You can make your carousel auto-navigate itself by specfying a millisecond value in this option.

 * The value you specify is the amount of time between 2 slides. The default is null, and that disables auto scrolling.

 * Specify this value and magically your carousel will start auto scrolling.

 *

 * @option speed : number - 200 is default

 * @example

 * $(".carousel").jCarouselLite({

 *      btnNext: ".next",

 *      btnPrev: ".prev",

 *      speed: 800

 * });

 * @desc Specifying a speed will slow-down or speed-up the sliding speed of your carousel. Try it out with

 * different speeds like 800, 600, 1500 etc. Providing 0, will remove the slide effect.

 *

 * @option easing : string - no easing effects by default.

 * @example

 * $(".carousel").jCarouselLite({

 *      btnNext: ".next",

 *      btnPrev: ".prev",

 *      easing: "bounceout"

 * });

 * @desc You can specify any easing effect. Note: You need easing plugin for that. Once specified,

 * the carousel will slide based on the provided easing effect.

 *

 * @option vertical : boolean - default is false

 * @example

 * $(".carousel").jCarouselLite({

 *      btnNext: ".next",

 *      btnPrev: ".prev",

 *      vertical: true

 * });

 * @desc Determines the direction of the carousel. true, means the carousel will display vertically. The next and

 * prev buttons will slide the items vertically as well. The default is false, which means that the carousel will

 *

 * @option circular : boolean - default is true

 * @example

 * display horizontally. The next and prev items will slide the items from left-right in this case.

 * $(".carousel").jCarouselLite({

 *      btnNext: ".next",

 *      btnPrev: ".prev",

 *      circular: false

 * });

 * @desc Setting it to true enables circular navigation. This means, if you click "next" after you reach the last

 * element, you will automatically slide to the first element and vice versa. If you set circular to false, then

 * if you click on the "next" button after you reach the last element, you will stay in the last element itself

 * and similarly for "previous" button and first element.

 *

 * @option visible : number - default is 3

 * @example

 * $(".carousel").jCarouselLite({

 *      btnNext: ".next",

 *      btnPrev: ".prev",

 *      visible: 4

 * });

 * @desc This specifies the number of items visible at all times within the carousel. The default is 3.

 * You are even free to experiment with real numbers. Eg: "3.5" will have 3 items fully visible and the

 * last item half visible. This gives you the effect of showing the user that there are more images to the right.

 *

 * @option start : number - default is 0

 * @example

 * $(".carousel").jCarouselLite({

 *      btnNext: ".next",

 *      btnPrev: ".prev",

 *      start: 2

 * });

 * @desc You can specify from which item the carousel should start. Remember, the first item in the carousel

 * has a start of 0, and so on.

 *

 * @option scrool : number - default is 1

 * @example

 * $(".carousel").jCarouselLite({

 *      btnNext: ".next",

 *      btnPrev: ".prev",

 *      scroll: 2

 * });

 * @desc The number of items that should scroll/slide when you click the next/prev navigation buttons. By

 * default, only one item is scrolled, but you may set it to any number. Eg: setting it to "2" will scroll

 * 2 items when you click the next or previous buttons.

 *

 * @option beforeStart, afterEnd : function - callbacks

 * @example

 * $(".carousel").jCarouselLite({

 *      btnNext: ".next",

 *      btnPrev: ".prev",

 *      beforeStart: function(a) {

 *          alert("Before animation starts:" + a);

 *      },

 *      afterEnd: function(a) {

 *          alert("After animation ends:" + a);

 *      }

 * });

 * @desc If you wanted to do some logic in your page before the slide starts and after the slide ends, you can

 * register these 2 callbacks. The functions will be passed an argument that represents an array of elements that

 * are visible at the time of callback.

 *

 *

 * @cat Plugins/Image Gallery

 * @author Ganeshji Marwaha/ganeshread@gmail.com

 */



(function ($) { // Compliant with jquery.noConflict()

    $.fn.jCarouselLite = function (o) {

        o = $.extend({

            btnPrev: null,

            btnNext: null,

            btnGo: null,

            mouseWheel: false,

            auto: 2000,

            hdir: 'left',

            vdir: 'up',



            speed: 800,

            easing: null,



            vertical: false,

            circular: true,

            visible: 3,

            start: 0,

            scroll: 1,



            mouseOverStop: true,



            beforeStart: null,

            afterEnd: null

        }, o || {});



        return this.each(function () { // Returns the element collection. Chainable.



            var running = false,
                animCss = o.vertical ? "top" : "left",
                sizeCss = o.vertical ? "height" : "width";

            var div = $(this),
                ul = $("ul:first", div),
                /* tLi = $("li", ul),*/ tLi = ul.children('li'),
                tl = tLi.size(),
                v = o.visible;

            if (o.circular) {

                //ul.prepend(tLi.slice(tl-v-1+1).clone())

                ul.prepend(tLi.slice(tl - v).clone())

                    .append(tLi.slice(0, v).clone());

                o.start += v;

            }



            //var li = $("li", ul), itemLength = li.size(), curr = o.start;

            var li = ul.children('li'),
                itemLength = li.size(),
                curr = o.start;

            div.css("visibility", "visible");



            li.css({
                overflow: "hidden",
                float: o.vertical ? "left" : "left"
            });

            ul.css({
                margin: "0",
                padding: "0",
                position: "relative",
                "list-style-type": "none",
                "z-index": "1"
            });

            div.css({
                overflow: "hidden",
                position: "relative",
                "z-index": "2",
                left: "0px"
            });



            var liSize = o.vertical ? height(li) : width(li); // Full li size(incl margin)-Used for animation

            var ulSize = liSize * itemLength; // size of full ul(total length, not just for the visible items)

            var divSize = liSize * v; // size of entire div(total length for just the visible items)



            var mouseOverTag = false; // this variable is used for mouseover the scrolling content to make the scrolling stop



            li.css({
                width: li.width(),
                height: li.height()
            });

            ul.css(sizeCss, ulSize + "px").css(animCss, -(curr * liSize));



            div.css(sizeCss, divSize + "px"); // Width of the DIV. length of visible images



            if (o.btnPrev)

                $(o.btnPrev).click(function () {

                    return go(curr - o.scroll);

                });



            if (o.btnNext)

                $(o.btnNext).click(function () {

                    return go(curr + o.scroll);

                });



            if (o.btnGo)

                $.each(o.btnGo, function (i, val) {

                    $(val).click(function () {

                        return go(o.circular ? o.visible + i : i);

                    });

                });



            if (o.mouseWheel && div.mousewheel)

                div.mousewheel(function (e, d) {

                    return d > 0 ? go(curr - o.scroll) : go(curr + o.scroll);

                });



            if (o.auto) {

                //var target; 

                var autoScrollingID = setInterval(function () {

                    if ((o.hdir == 'right') || (o.vdir == 'down')) {

                        go(curr - o.scroll);

                        //target = curr-o.scroll;

                    } else go(curr + o.scroll);

                }, o.auto + o.speed);

                /*Dan add start*/

                if (o.mouseOverStop) {

                    div.bind('mouseover', function () {

                        clearInterval(autoScrollingID);

                    }).bind('mouseout', function () {

                        autoScrollingID = setInterval(function () {

                            if ((o.hdir == 'right') || (o.vdir == 'down')) {

                                go(curr - o.scroll);

                                //target = curr-o.scroll;

                            } else go(curr + o.scroll);

                        }, o.auto + o.speed);

                    });

                } //if(o.mouseOverStop) end



                //Diva Add for mouseover Prev & Next btns to pause the auto scroll

                //var auto;//temp varient for keep auto value if exist

                if ((o.btnPrev) || (o.btnNext)) {

                    //auto = o.auto;

                    $(o.btnPrev + "," + o.btnNext).hover(

                        function () {

                            clearInterval(autoScrollingID);

                        },

                        function () {

                            autoScrollingID = setInterval(function () {

                                if ((o.hdir == 'right') || (o.vdir == 'down')) {

                                    go(curr - o.scroll);

                                    //target = curr-o.scroll;

                                } else go(curr + o.scroll);

                            }, o.auto + o.speed);

                        }

                    );

                }

                /*Dan add end*/

            }



            function vis() {

                return li.slice(curr).slice(0, v);

            };



            function go(to) {

                if (!running) {



                    if (o.beforeStart) {

                        //o.beforeStart.call(this, vis());

                        if (o.beforeStart.call(this, vis()) == 'exit') return false;

                    }

                    if (o.circular) { // If circular we are in first or last, then goto the other end

                        //$("#trace").html("tl:"+tl+"/itemLength:"+itemLength);



                        if (to <= o.start - v - 1) { // If first, then goto last

                            /*yu = itemLength % o.scroll;

                            if(yu==0)

                            {

                            	ul.css(animCss, -((itemLength-(v*2))*liSize)+"px");

                            }

                            else{

                            	ul.css(animCss, -((itemLength-(v*2))*liSize) - liSize + "px" );

                            }*/



                            ul.css(animCss, -((itemLength - (v * 2)) * liSize) + "px");

                            // If "scroll" > 1, then the "to" might not be equal to the condition; it can be lesser depending on the number of elements.

                            curr = to == o.start - v - 1 ? itemLength - (v * 2) - 1 : itemLength - (v * 2) - o.scroll;

                        } else if (to >= itemLength - v + 1) { // If last, then goto first

                            /*yu = itemLength % o.scroll;

                            if((yu==0)||v==1)

                            {

                            	ul.css(animCss, -( (v) * liSize ) + "px" );

                            }

                            else{

                            	ul.css(animCss, -( (v-1) * liSize ) + "px" );

                            }*/

                            ul.css(animCss, -((v) * liSize) + "px");

                            // If "scroll" > 1, then the "to" might not be equal to the condition; it can be greater depending on the number of elements.

                            curr = to == itemLength - v + 1 ? v + 1 : v + o.scroll;

                        } else curr = to;

                    } else { // If non-circular and to points to first or last, we just return.

                        if (to < 0 || to > itemLength - v) return;

                        else curr = to;

                    } // If neither overrides it, the curr will still be "to" and we can proceed.



                    running = true;

                    ul.animate(

                        animCss == "left" ? {
                            left: -(curr * liSize)
                        } : {
                            top: -(curr * liSize)
                        }, o.speed, o.easing,

                        function () {

                            // Disable buttons when the carousel reaches the last/first, and enable when not

                            if (!o.circular) {

                                $(o.btnPrev + "," + o.btnNext).removeClass("disabled");

                                $((curr - o.scroll < 0 && o.btnPrev)

                                    ||

                                    (curr + o.scroll > itemLength - v && o.btnNext)

                                    ||

                                    []

                                ).addClass("disabled");

                            }



                            if (o.afterEnd)

                                o.afterEnd.call(this, vis());

                            running = false;

                        }

                    );

                    // Disable buttons when the carousel reaches the last/first, and enable when not

                    /* if(!o.circular) {

                         $(o.btnPrev + "," + o.btnNext).removeClass("disabled");

                         $( (curr-o.scroll<0 && o.btnPrev)

                             ||

                            (curr+o.scroll > itemLength-v && o.btnNext)

                             ||

                            []

                          ).addClass("disabled");

                     }*/



                }

                return false;

            };

        });

    };



    function css(el, prop) {

        return parseInt($.css(el[0], prop)) || 0;

    };

    function width(el) {

        return el[0].offsetWidth + css(el, 'marginLeft') + css(el, 'marginRight');

    };

    function height(el) {

        return el[0].offsetHeight + css(el, 'marginTop') + css(el, 'marginBottom');

    };



})(jQuery);